1-215-003-02 Ford 9 in. 31 Spline LSD TorqueWorm HD Case Third Member Assembly 3.25:1
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SPEEDMASTERPART NUMBER: 746-1-215-003-02

1-215-003-02 Ford 9 in. 31 Spline LSD TorqueWorm HD Case Third Member Assembly 3.25:1

$1,69000
ShippingShips on 11/09/2026
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31-Spline Third Member Assemblies
Ford 9 in. 31 Spline LSD TorqueWorm HD Case Third Member Assembly
  • 3.25:1

    Speedmaster 1-215-003-02 Features:

    Speedmaster Ford 9 in. third member assemblies are designed to help you get that horsepower to the ground. They include aluminumn thru-bolt design center section, as well as our famous TorqueWorm geared limited slip differential, 1350 series yoke, daytona pinion support, and gear ratio. Whether you're assembling a daily driver, street rod, or race car, Speedamster's third member assemblies will provide the durability that your vehicle deserves. CASE: Our aluminium cases are made from A356-T6 aluminium, our bearing caps are one-piece billet, with a through bolt design and extra material is added to the bearing caps. These cases are offered in 3.250" & 4.000" bearing diameter to accommodate 28, 31, 35 and 40-spline carriers and spools. These extras truly make this Aluminium case the ultimate Ford 9" case, rated to +1000 horsepower. All our aluminium third members come with 12 point through bolts and a billet pinion support, which gives us an advantage over our competition. The TORQUEWORM is a torque biasing 6 pinion gear type limited-slip unit. This is a preloaded unit allowing for a faster-reacting unit. Unlike our competitors that only use 3 or 4 pinion gears. The use of 6 pinion gears means the stress on gears is spread over a greater surface area, reducing the load on all internal components. The internal components are made from EN36 Material as used in racing such as V8 SUPERCAR.

    • Through bolt design and extra material is added to the bearing caps
    • 1350 Billet Yoke
    • Daytona pinion support
    • 8620 Gear set
    • Ready-to-Install Third Member Assemblies

      Speedmaster Ford 9-in. Complete Third Member Assemblies feature a Torque Worm 6-pinion limited-slip or full-spool differential in 28 and 31-spline axle shaft configurations. Third Member Assemblies are available in your choice of the most popular gear ratios and contain a new A356-T6 aluminum case that is assembled with all-new bearings, seals, heavy-duty ring and pinion, one-piece billet (through bolt) main caps,12-point bolts, u-joints/u-bolts, and precision-machined 1350 billet steel yoke. The 1350-series yoke is ideal for all forms of motorsports ranging from V8 SUPERCAR through Group 1 Drag Racing. 

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      HD-style cases are rated at 850 HP but limited due to the size of the spline axle shaft.
      Ultra HD-style cases are rated at 1200 HP but limited due to the size of the spline axle shaft.

      LSD (Limited Slip Differential)
      HD ( Heavy Duty)

      Note: Each Third Member is to be used with a mineral-based oil of a range of EP140 Extreme pressure at a minimum. DO NOT USE split grades eg. 85/140 (these are not recommended). Failure to use the correct oil can result in gear damage, noise and may void your manufacturer's warranty.

    Part TypeThird Member Assembly
    Product LineSpeedmaster Ford 9-in. Complete Third Member Assemblies
    BrandSPEEDMASTER
    Package Height13.0
    Package Width14.0
    Package Length20.5
    Weight82.6 PG
    Part CategoryPerformance Parts
    Part FitmentSemi Universal
    Vendor Part Number1-215-003-02
    Package Qty1
    Package TypeEA
    Some parts are not legal for use in California or other states with similar laws / regulations
    p65 warning